Self-driving cars are one place we can start to get it right. They provide yet another example of the challenges to autonomy and freedom brought by technology, and have the potential to bring the debate home for people who don't feel as concerned by privacy issues related to email and laptops.

On Tuesday, Google unveiled a proper self-driving car, with no steering wheel, no brakes, no pedals. Google expects these no-hands-on-wheel cars to hit the roads in 2017 and it is up to us to craft the laws and policies that will govern their use. Such decisions cannot be left for tomorrow. As Google's working prototype reveals, the robocars of the future are here. And because people have a long history of projecting personal freedom and autonomy onto automobiles, they will have an innate understanding of the stakes.